(n+3)*3=n+21

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Solution for (n+3)*3=n+21 equation:


Simplifying
(n + 3) * 3 = n + 21

Reorder the terms:
(3 + n) * 3 = n + 21

Reorder the terms for easier multiplication:
3(3 + n) = n + 21
(3 * 3 + n * 3) = n + 21
(9 + 3n) = n + 21

Reorder the terms:
9 + 3n = 21 + n

Solving
9 + 3n = 21 + n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-1n' to each side of the equation.
9 + 3n + -1n = 21 + n + -1n

Combine like terms: 3n + -1n = 2n
9 + 2n = 21 + n + -1n

Combine like terms: n + -1n = 0
9 + 2n = 21 + 0
9 + 2n = 21

Add '-9' to each side of the equation.
9 + -9 + 2n = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2n = 21 + -9
2n = 21 + -9

Combine like terms: 21 + -9 = 12
2n = 12

Divide each side by '2'.
n = 6

Simplifying
n = 6

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